Merge pull request #163 from cschug/upgrade_heimdall

chore: upgrade Heimdall 2.5.6 -> 2.6.1

docker-compose/heimdall/docker-compose.yaml

@@ -1,7 +1,7 @@
 ---
 services:
   heimdall:
-    image: lscr.io/linuxserver/heimdall:2.5.6
+    image: lscr.io/linuxserver/heimdall:2.6.1
     container_name: heimdall
     environment:
       - PUID=1000